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RELEASE-NOTES.txt
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RELEASE-NOTES.txt
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Hipparchus 3.0 RELEASE NOTES
The Hipparchus team is pleased to announce the release of hipparchus-3.0
The Hipparchus library is a library of mathematical components. It started as a fork of Apache Commons Math.
This is a major release.
Changes in this version include:
New features:
o issues/221: Added Principal Component Analysis. Thanks to Paul King.
o issues/270: Max check interval in events detectors can now depend on current state.
o Added torque-free motion model for non-symmetrical rigid body in ODE tests,
with analytical theoretical reference solution. Thanks to Lucas Girodet.
o issues/212: Added Blendable interface and its implementation in RealMatrix and Vector interfaces.
Changed Vector interface parameters.
Added SmoothStepFactory which allow for quick creation of common and generic smoothstep function.
o issues/218: Fieldified Erf and Gamma classes and added FieldContinuedFraction.
Fixed Bugs:
o issues/238: Fixed internal error in RandomPercentile aggregation.
o issues/230: Fixed wrong intermediate frame in torque-free motion model.
o issues/275: UnivariateDerivative now implements Comparable.
o issues/274: Complex now implements Comparable, using real part as primary sort order
and imaginary part as secondary sort order (similar to what ComplexComparator
already did).
o issues/253: Fixed eigenvalues/eigenvectors sorting in EigenDecompositionSymmetric.
o issues/273: Added a protection against out of range BigFraction.
o issues/272: Fixed compatibility with recent JDK.
o issues/257: Made FieldPolynomialSplineFunction operational with Field not inheriting from Comparable. Thanks to Romain Serra.
o issues/262: Fixed determinant computation in eigen decomposition with complex eigenvalues.
o issues/259: Only remove input coefficients of FieldPolynomialFunction that satisfy isZero(). Thanks to Romain Serra.
o issues/249: Generate zero vectors in OrderedComplexEigenDecomposition when the number
of eigenvectors is smaller than the dimension.
o issues/248: Allow customization of eigen value ordering in OrderedComplexEigenDecomposition.
o issues/228: Fixed FastMath.expm1(x) for huge values of x.
Changes:
o issues/271: Removed unused mapper in initializeStep. Thanks to Romain Serra.
o issues/223: Separated {Field}ODEEventDetector and {Field}ODEEventHandler.
o issues/220: Added reset state and stop integration capability at end of step for ODE integrators.
o issues/243: Improve management of Cardan/Euler rotations close to singularity.
o Replaced EigenDecomposition by EigenDecompositionSymmetric and EigenDecompositionNonSymmetric.
o Removed OrderedEigenDecomposition.
o issues/256: Improved performance for reciprocal, division and square root with
DerivativeStructure and FieldDerivativeStructure. Thanks to Romain Serra.
o issues/227: Renamed Decimal64{Field} into Binary64{Field}.
o issues/223: Separated {Field}ODEEventDetector and {Field}ODEEventHandler.
For complete information on Hipparchus, including instructions on how to submit bug reports,
patches, or suggestions for improvement, see the Hipparchus website:
https://www.hipparchus.org/